<template>
  <div
    :class="isShow ? 'art-cmt-container-1' : 'art-cmt-container-2'"
    ref="cmtRef"
  >
    <!-- 评论列表 -->
    <div class="cmt-list">
      <!-- 评论的 Item 项 -->
      <van-list
        v-model="loading"
        :finished="finished"
        finished-text="没有更多了"
        @load="handleLoad"
        offset="30"
        :immediate-check="false"
      >
        <div class="cmt-item" v-for="item in comtList" :key="item.com_id">
          <!-- 头部区域 -->
          <div class="cmt-header">
            <!-- 头部左侧 -->
            <div class="cmt-header-left">
              <img :src="item.aut_photo" alt="" class="avatar" />
              <span class="uname">{{ item.aut_name }}</span>
            </div>
            <!-- 头部右侧 -->
            <div class="cmt-header-right">
              <van-icon
                @click="handleLike(false, item)"
                v-if="item.is_liking"
                name="like"
                size="16"
                color="red"
              />
              <van-icon
                @click="handleLike(true, item)"
                v-else
                name="like-o"
                size="16"
                color="gray"
              />
            </div>
          </div>
          <!-- 主体区域 -->
          <div class="cmt-body">{{ item.content }}</div>
          <!-- 尾部区域 -->
          <div class="cmt-footer">{{ timeAgo(item.pubdate) }}</div>
        </div>
      </van-list>
      <!-- 底部添加评论区域 - 1 -->
      <div class="add-cmt-box van-hairline--top" v-if="isShow">
        <van-icon name="arrow-left" size="0.48rem" @click="$router.back()" />
        <div class="ipt-cmt-div" @click="isShow = false">发表评论</div>
        <div class="icon-box">
          <van-badge :content="totalCount" max="99">
            <van-icon
              @click="handleScroll"
              name="comment-o"
              size="0.53333334rem"
            />
          </van-badge>
          <van-icon name="star-o" size="0.53333334rem" />
          <van-icon name="share-o" size="0.53333334rem" />
        </div>
      </div>

      <!-- 底部添加评论区域 - 2 -->
      <div class="cmt-box van-hairline--top" v-else>
        <textarea
          v-model.trim="content"
          placeholder="友善评论、理性发言、阳光心灵"
          v-focus
          @blur="Delay"
          @keydown.enter="handlepulish"
        ></textarea>
        <van-button
          type="default"
          :disabled="!content"
          @click.stop="handlepulish"
          >发布</van-button
        >
      </div>
    </div>
  </div>
</template>

<script>
import {
  getReviewsApi,
  likeReviewsApi,
  unlikeReviewsApi,
  getLeaveComment,
} from "@/api/article";
export default {
  name: "CommentList",
  data() {
    return {
      content: "",
      comtList: [],
      totalCount: 0,
      lastId: "",
      isShow: true,
      loading: false,
      finished: false,
    };
  },
  created() {
    this.getReviews();
  },
  methods: {
    // 获取评论列表
    async getReviews() {
      const resp = await getReviewsApi(
        this.$route.query.id,
        this.lastId || null,
        10
      );
      // console.log(resp);
      const { results, last_id: lastId, total_count: totalCount } = resp.data;
      // 后台没有数据提示用户
      if (!results.length) return (this.finished = true);
      this.comtList = [...this.comtList, ...results];
      this.lastId = lastId;
      this.totalCount = totalCount || "";
      this.loading = false;
    },
    // 评论点赞取消
    async handleLike(flag, item) {
      try {
        flag
          ? await likeReviewsApi(item.com_id)
          : await unlikeReviewsApi(item.com_id);
        item.is_liking = !item.is_liking;
        await this.getReviews();
        flag
          ? this.$toast.success("点赞成功")
          : this.$toast.success("取消成功");
      } catch (error) {
        flag ? this.$toast.fail("点赞失败") : this.$toast.fail("取消失败");
      }
    },
    // 点击评论图标滑动
    handleScroll() {
      // 需求:点击评论图标让评论列表盒子出现在可视区
      // 方式1: 利用 offsetTop + document.documentElement,scrollTop/window.scrollTo(x，y)
      // window.scrollTo(0,this.$refs,cmtRef.offsetTop)
      // document.documentElement,scrollTop = this,$refs,cmtRef.offsetTop
      // 式2: 找到评论组件的根元素 + 调用scrollIntoview方法
      // 1，获取评论组件的根元素
      // const el = this.$refs.cmtRef
      // 2。调用scrollIntoView方法
      // el.scrollIntoView({
      // 添加滚动动画
      // behavior: 'smooth'})
      // const a = this.$refs.cmtRef;
      // a.scrollIntoView();
      this.$refs.cmtRef.scrollIntoView({ behavior: "smooth" });
    },
    // 发布评论
    async handlepulish() {
      // 非空校验

      if (!this.content) return;
      const resp = await getLeaveComment(this.$route.query.id, this.content);
      console.log(resp);
      this.comtList.unshift(resp.data.new_obj);
      this.totalCount++;
      // await this.getReviews();
      this.content = "";
      this.isShow = true;
    },
    //文本域失焦
    Delay() {
      // 设置为异步
      setTimeout(() => {
        this.isShow = true;
      }, 0);
    },
    // 上拉加载
    handleLoad() {
      this.getReviews();
    },
  },
};
</script>

<style scoped lang="less">
.cmt-list {
  padding: 10px;
  .cmt-item {
    padding: 15px 0;
    + .cmt-item {
      border-top: 1px solid #f8f8f8;
    }
    .cmt-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      .cmt-header-left {
        display: flex;
        align-items: center;
        .avatar {
          width: 40px;
          height: 40px;
          background-color: #f8f8f8;
          border-radius: 50%;
          margin-right: 15px;
        }
        .uname {
          font-size: 12px;
        }
      }
    }
    .cmt-body {
      font-size: 14px;
      line-height: 28px;
      text-indent: 2em;
      margin-top: 6px;
      word-break: break-all;
    }
    .cmt-footer {
      font-size: 12px;
      color: gray;
      margin-top: 10px;
    }
  }
}
/*美化 - 文章详情 - 底部的评论页面 */
// 外层容器
.art-cmt-container-1 {
  padding-bottom: 30px;
}
.art-cmt-container-2 {
  padding-bottom: 80px;
}

// 发布评论的盒子 - 1
.add-cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 46px;
  line-height: 46px;
  padding-left: 10px;
  .ipt-cmt-div {
    flex: 1;
    border: 1px solid #efefef;
    border-radius: 15px;
    height: 30px;
    font-size: 12px;
    line-height: 30px;
    padding-left: 15px;
    margin-left: 10px;
    background-color: #f8f8f8;
  }
  .icon-box {
    width: 40%;
    display: flex;
    justify-content: space-evenly;
    line-height: 0;
  }
}

.child {
  width: 20px;
  height: 20px;
  background: #f2f3f5;
}

// 发布评论的盒子 - 2
.cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  padding-left: 10px;
  box-sizing: border-box;
  background-color: white;
  textarea {
    flex: 1;
    height: 66%;
    border: 1px solid #efefef;
    background-color: #f8f8f8;
    resize: none;
    border-radius: 6px;
    padding: 5px;
  }
  .van-button {
    height: 100%;
    border: none;
  }
}
</style>
